Is the displeasure expressed by the father in a moment of anger considered a reality, and is the son's complaint to his father considered an act of disobedience, and is the son's supplication for his deceased father considered an act of filial piety and will it be answered?

Filial piety is among the greatest acts of devotion, and disobedience to parents is among the greatest abominations. Cutting ties with them or abandoning them constitutes disobedience. However, if a father forgives his son before his death, nothing of that (disobedience) will be held against the son. A son's prayer for his deceased father is a righteous act of devotion that is answered, and the deceased benefits from it. Complaining about parents to people, if it is merely for the sake of narration and not for a legitimate, intended purpose, is an act of disobedience and forbidden backbiting. Its ugliness intensifies if it is directed at the father. However, if it is for an intended purpose, such as obtaining a right or repelling injustice, then there is no harm in it.